Migration targets have been change, some statistics of interest from a [related Meta.SO question][1].

> In the last 90 days (data gathered on January 15th 2012), Server Fault
> has had 597 question migrated away from it:
> 
>   - Super User†: 332, 12% rejected
>   - Stack Overflow†: 74, 10% rejected
>   - Unix & Linux: 47, 14% rejected
>   - DBA: 35, 8% rejected
>   - Apple: 32, 0% rejected
>   - Web Masters†: 27, 7% rejected
>   - Ubuntu: 20, 5% rejected
>   - Security: 18, 0% rejected
>   - SharePoint: 7, -- not enough data
>   - Programmers: 2, -- not enough data
>   - WordPress, Web Apps, Project Management, Electronics: 1 each, -- not enough data
> 
> <sub>†Existing migration targets at time of writing.</sub>
> 
> Tossing out the rejections, this would mean that approximately **154
> legitimate migrations** were not covered by our migration targets
> (compared to  384 that were).
> 
> Note, there's about a 10% chance the migration is rejected (closed on
> the destination site); this is important.

  [1]: http://meta.stackoverflow.com/questions/118685/should-some-communities-have-more-than-4-migration-targets